Transformer



Patented Nov. 10, 1925.

UNITED STATES ,tanze 'PATENT orricE.

.ROLAND F. BEERS, OF BROOKLYN, NEW YORK, A-.SSIGNIOR TO WESTERN ELECTRIG COMPANY, INCORPORATED, OF NEW YORK, N.

Y., A CORPORATION OIF NEW YORK.

TRANSFORMER.

Application led July 26, 1923. Serial No. 653,870.

To all whom t may concern:

Be it known that I, ROLAND F. Bancs,

a citizen of the United States, residing at Brooklyn, in the county of Kings, State of New York, have invented certain new and useful Improven'ients in Transfer-meis, of which the following is a full, clear, concise, and exact description.

This'invention relates to transformers.

An object of this invention is to reduce Ithe magnetic leakage and capacity imbalances between the windings of a transformer.

ne way the above object may be accomplished when applied to a transformer, with a shell type of core is to wind each winding in a plurality of sections on-diferent parts of the core, the layers of one winding being located between ing. This arrangement, particularlyy when the inner and outer portions of the second winding are connected alternately, results in a transformer of very low magnetic leakage.

The capacity between the windings may bev balanced and made o negligible value by inserting shields between the individual portions of the wmdmgs, around the outer f winding and between the spool heads and the windings, whereby the various sectionsy of the windings may be so connected as to give a symmetrical distribution of the natural capacities between the various windings and the shield.

Referring to the drawings, Fig. 1 illustrates an embodiment of this invention par-l ticularly adapted for use in the so-called shell type of transformers; and Fig-2 illustrates in a schematic manner the symmetrical distribution of the natural capacity effects of the transformer.

`which Win 'be The transformer spool ,20 illustrated in F ig. 1 is divided into two sections bya suitable separator 21, on opposite sides of which are located the two inner windings 22 and 23 ywhich form part of the. transformer primary winding. On topof they 'windings 22 and 23 and substantially covering the same are suitable shielding means suchas sheets of.y copper foil 24 and 25, the purpose of described later.` 1Wound around the shielding means 24 and 25 are thetwo sections 26 and 27 of the secondary The remaining of the primarywinding are superposed on the secondary winding sections and are shielded from the translayers of the second wind- 4the transformer, it is preferable that the foursections of the primary winding be connected such that terminal 5 forms one f terminal to be connected to the line, terminals 6 and -7 connected together, terminals 8 and 9 connected together, terminals-10 and 11 connected together, while terminal 12 serves as the other connection -tothe line. The `two sections of the secondary winding arejpreferablyfconnected such that terminals 13 and 16 are the exterior`tez'minals while terminals 14 and 15 are connected toof the natural transformer capacities as shown in Fig. 2. Capacity 40 represents the natural capacity between the inner layer of -winding 29 and the ,shield 32; capacity 41,

the natural capacity between the outer layer of winding 29 and the shield 31; capacity 42, the natural capacity between the outer layer of winding 22 and shield 24, capacity '43, the natural capacity of winding 22 to the shielding strip 36, which capacity may be regarded as concentrated at the linner winding thereof; 'capacity 44, the natural capacity between the inner layer of. winding 28 vand the shield 33, capacity 45, the natural capacity between Vthe outer layer of winding 28 and the shield 30; `capacity 46, the natural capacity between the outer layer of winding 23 and the shield 25, capacity 47, the ,natural capacity between the winding .23 and the shield 37, which capacity may be regarded as concentrated at the inner layer;

natural capacity between the outer'layer of winding 26y and shield 33; capacity. 499 the natural capacity between the inner layer of winding 26 and capacity 48, ythe,

shield l'24; capacity 50, the natural capacity between the. inner layer of winding 27 and .the shield 25, capacity l, the natural capacity between the outer layer of winding 27 and shield 32.

Incase it is desired to wind the transformer in a greater number of sections, the

same procedure may be followed, namely,.

by including one of the 'transformer windings between layers of the other winding,

of the natural ca acity effects of the windings'to the shiel ing means.

The type of the transformer described above has been found, on account of its low magnetic leakage and symmetrical capacity distribution, to be? particularly eiicient in transmission circuits in which uniform transmission efiiciency is desiredfor a wide range or frequencies. In one particular case, for example, the transformer ot' this invention was found to have a substantially constant transmission eiiciency from 300 to 6,000 or 8,000 cycles per second.

What is claimed is:

l. A transformer comprising a winding of a plurality of layers, a second winding interposed between the layers of said firstv winding, said first winding being wound in a plurality of sections locate on different parts of the transformer core, the portions of said irst winding in the plurality of sections exterior to the second winding being alternately .connected with the portions of the first winding on the interior of the .second winding to form the said rst winding.

2. A transformer comprising a winding of a plurality of superposed layers located` at different radialdistances from the transformer core, a second winding interposed between the layers of said rst winding,

each 'of said windings being Wound in a plurality of sections located at different points along the transformer core, said windings being symmetrically arranged and having the individual sections interconnected with res ect to the individual layers and their istribution along. the core so that the transformer is balanced with respect to the transformer terminals for natural capacity effects existing between the windings.

3. A transformer comprising av Winding of a plurality of superposed layers located at d iiferent radial distances froml the transformer core, a second winding interposed between the layers of said first winding, said first winding bein round on a plurality of sections locate at different points along the transformer core, shielding means between the-various portions of said windings and aroundthe outer wind-ing, the portions of said windings being interconnected with respect to the individual layers and their distribution along the'\core so' that the natural capacity ei'ects betweenl the windings'and shielding means 'are symmetrically situated with respect to the transformer terminals. y

` fi. A transformer comprising a winding of a plurality of layers, a second winding interposed between the layers of said first winding, said first winding beingwound in a plurality of sections located on different parts of the transformer spool, the portions of said first windino' in the plurality of sections exterior to the second winding being alternately connected to the portions interior to the second winding to form the first winding, the lconnections of the various sections being arranged to give a symmetrical distribution of the natural capacities existing between thevarious' parts of the transformer,

lin witness whereof, l hereunto subscribe my name this 23rd day of July AQD., 1923.

RULND F. BEBES. 

